package com.mmall.concurrency.example.commonUnsafes;

import com.mmall.concurrency.annotions.ThreadSafes;
import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

/**
 * <p>Descriptions...
 *
 * @author Diamon.Cheng
 * @date 2019/12/8.
 */
@Slf4j
@ThreadSafes
public class ArrayListExamples {
    
    // 请求总数
    public static int clientTotal = 5000;
    
    // 同时并发执行的线程数
    public static int threadTotal = 200;
    
    private static List<Integer> list = new ArrayList<>();
    
    public static void main(String[] args) throws Exception {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal; i++) {
            final int count = i;
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    update(count);
                    semaphore.release();
                } catch (Exception e) {
                    log.error("exception", e);
                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        log.info("size:{}", list.size());
    }
    
    private static void update(int i) {
        list.add(i);
    }
}
